Wednesday - 1 August 2012

Today, my group start to doing receive SMS on GSM Modem. This is some of coding that useful to receive SMS on GSM modem.

AT command	Meaning
+CNMI	New message indications
+CMGL	List messages
+CMGR	Read messages
+CNMA	New message acknowledgement

Delete SMS from Message Storage (AT+CMGD)

The AT command +CMGD (command name in text: Delete Message) is used to delete SMS message(s) from message storage. The message storage area from which SMS messages are deleted is specified by the +CPMS AT command (command name in text: Preferred Message Storage).

AT+CMGD=index[,flag]

The SMS specification has defined these flag values: 0, 1, 2, 3 and 4.

• 0. Meaning: Delete only the SMS message stored at the location index from the message storage area. This is the default value.
• 1. Meaning: Ignore the value of index and delete all SMS messages whose status is "received read" from the message storage area.
• 2. Meaning: Ignore the value of index and delete all SMS messages whose status is "received read" or "stored sent" from the message storage area.
• 3. Meaning: Ignore the value of index and delete all SMS messages whose status is "received read", "stored unsent" or "stored sent" from the message storage area.
• 4. Meaning: Ignore the value of index and delete all SMS messages from the message storage area

Delete SMS on SIM using AT Command